avc_e00read.c

用于读取TAB、MIF、SHP文件的类

     *----------------------------------------------------------------*/
    if (bFoundArcFile && bFoundTableFile)
        return AVCCoverWeird;

    /*-----------------------------------------------------------------
     * V7 Coverages... they are the easiest to recognize
     * because of the ".adf" file extension
     *----------------------------------------------------------------*/
    if (bFoundAdfFile)
        return AVCCoverV7;

    return AVCCoverTypeUnknown;
}


/**********************************************************************
 *                         _AVCE00ReadAddJabberwockySection()
 *
 * Add to the squeleton a section that contains subsections 
 * for all the files with a given extension.
 *
 * Returns Updated Coverage precision
 **********************************************************************/
static int _AVCE00ReadAddJabberwockySection(AVCE00ReadPtr psInfo,
                                            AVCFileType   eFileType,
                                            const char   *pszSectionName,
                                            int           nCoverPrecision,
                                            const char   *pszFileExtension,
                                            char        **papszCoverDir )
{
    int         iSect, iDirEntry, nLen, nExtLen;
    GBool       bFoundFiles = FALSE;
    AVCBinFile *psFile=NULL;

    nExtLen = strlen(pszFileExtension);

    /*-----------------------------------------------------------------
     * Scan the directory for files with a ".txt" extension.
     *----------------------------------------------------------------*/

    for (iDirEntry=0; papszCoverDir && papszCoverDir[iDirEntry]; iDirEntry++)
    {
        nLen = strlen(papszCoverDir[iDirEntry]);

        if (nLen > nExtLen && EQUAL(papszCoverDir[iDirEntry] + nLen-nExtLen, 
                                    pszFileExtension) &&
            (psFile = AVCBinReadOpen(psInfo->pszCoverPath, 
                                     papszCoverDir[iDirEntry],
                                     psInfo->eCoverType, eFileType,
                                     psInfo->psDBCSInfo)) != NULL)
        {
            if (nCoverPrecision == AVC_DEFAULT_PREC)
                nCoverPrecision = psFile->nPrecision;
            AVCBinReadClose(psFile);

            if (bFoundFiles == FALSE)
            {
                /* Insert a "TX6 #" header before the first TX6 file
                 */
                iSect = _AVCIncreaseSectionsArray(&(psInfo->pasSections), 
                                                  &(psInfo->numSections), 1);
                psInfo->pasSections[iSect].eType = AVCFileUnknown;

                psInfo->pasSections[iSect].pszName = 
                            CPLStrdup(CPLSPrintf("%s  %c", pszSectionName,
                                  (nCoverPrecision==AVC_DOUBLE_PREC)?'3':'2'));

                bFoundFiles = TRUE;
            }

            /* Add this file to the squeleton 
             */
            iSect = _AVCIncreaseSectionsArray(&(psInfo->pasSections), 
                                              &(psInfo->numSections), 1);

            psInfo->pasSections[iSect].eType = eFileType;
            psInfo->pasSections[iSect].pszFilename= 
                                   CPLStrdup(papszCoverDir[iDirEntry]);

            /* pszName will contain only the classname without the file 
             * extension */
            psInfo->pasSections[iSect].pszName =
                                   CPLStrdup(papszCoverDir[iDirEntry]);
            psInfo->pasSections[iSect].pszName[nLen-nExtLen] = '\0';
        }
    }

    if (bFoundFiles)
    {
        /* Add a line to close the TX6 section.
         */
        iSect = _AVCIncreaseSectionsArray(&(psInfo->pasSections), 
                                          &(psInfo->numSections), 1);
        psInfo->pasSections[iSect].eType = AVCFileUnknown;
        psInfo->pasSections[iSect].pszName = CPLStrdup("JABBERWOCKY");
    }

    return nCoverPrecision;
}

/**********************************************************************
 *                     _AVCE00ReadNextLineE00()
 *
 * Processes the next line of input from the E00 file.
 * (See AVCE00WriteNextLine() for similar processing.)
 *
 * Returns the next object from the E00 file, or NULL.
 **********************************************************************/
static void *_AVCE00ReadNextLineE00(AVCE00ReadE00Ptr psRead,
        const char *pszLine)
{
    int nStatus = 0;
    void *psObj = 0;

    AVCE00ParseInfo *psInfo = psRead->hParseInfo;

    CPLErrorReset();

    ++psInfo->nCurLineNum;

    if (psInfo->bForceEndOfSection)
    {
        /*-------------------------------------------------------------
         * The last call encountered an implicit end of section, so
         * we close the section now without waiting for an end-of-section
         * line (there won't be any!)... and get ready to proceed with
         * the next section.
         * This is used for TABLEs.
         *------------------------------------------------------------*/
        AVCE00ParseSectionEnd(psInfo, pszLine, TRUE);
        psRead->eCurFileType = AVCFileUnknown;
    }

    /*-----------------------------------------------------------------
     * If we're at the top level inside a supersection... check if this
     * supersection ends here.
     *----------------------------------------------------------------*/
    if (AVCE00ParseSuperSectionEnd(psInfo, pszLine) == TRUE)
    {
        /* Nothing to do... it's all been done by the call to 
         * AVCE00ParseSuperSectionEnd()
         */
    }
    else if (psRead->eCurFileType == AVCFileUnknown)
    {
        /*-------------------------------------------------------------
         * We're at the top level or inside a supersection... waiting 
         * to encounter a valid section or supersection header 
         * (i.e. "ARC  2", etc...)
         *------------------------------------------------------------*/

        /*-------------------------------------------------------------
         * First check for a supersection header (TX6, RXP, IFO, ...)
         *------------------------------------------------------------*/
        if ( AVCE00ParseSuperSectionHeader(psInfo,
                                           pszLine) == AVCFileUnknown )
        {
            /*---------------------------------------------------------
             * This was not a supersection header... check if it's a simple
             * section header
             *--------------------------------------------------------*/
            psRead->eCurFileType = AVCE00ParseSectionHeader(psInfo,
                    pszLine);
        }
        else
        {
            /* got supersection */
        }

        if (psRead->eCurFileType == AVCFileTABLE)
        {
            /*---------------------------------------------------------
             * send the first header line to the parser and wait until
             * the whole header has been read.
             *--------------------------------------------------------*/
            AVCE00ParseNextLine(psInfo, pszLine); 
        }
        else if (psRead->eCurFileType != AVCFileUnknown)
        {
            /*---------------------------------------------------------
             * found a valid section header
             *--------------------------------------------------------*/
        }
    }
    else if (psRead->eCurFileType == AVCFileTABLE &&
             ! psInfo->bTableHdrComplete )
    {
        /*-------------------------------------------------------------
         * We're reading a TABLE header... continue reading lines
         * from the header
         *
         * Note: When parsing a TABLE, the first object returned will 
         * be the AVCTableDef, then data records will follow.
         *------------------------------------------------------------*/
        psObj = AVCE00ParseNextLine(psInfo, pszLine); 
        if (psObj)
        {
			/* got table header */
            /* TODO: Enable return of table definition? */
            psObj = NULL;
        }
    }
    else
    {
        /*-------------------------------------------------------------
         * We're are in the middle of a section... first check if we
         * have reached the end.
         *
         * note: The first call to AVCE00ParseSectionEnd() with FALSE will 
         *       not reset the parser until we close the file... and then
         *       we call the function again to reset the parser.
         *------------------------------------------------------------*/
        if (AVCE00ParseSectionEnd(psInfo, pszLine, FALSE))
        {
            psRead->eCurFileType = AVCFileUnknown;
            AVCE00ParseSectionEnd(psInfo, pszLine, TRUE);
        }
        else
        /*-------------------------------------------------------------
         * ... not at the end yet, so continue reading objects.
         *------------------------------------------------------------*/
        {
            psObj = AVCE00ParseNextLine(psInfo, pszLine);

            if (psObj)
            {
				/* got object */
            }
        }
    }

    if (CPLGetLastErrorNo() != 0)
        nStatus = -1;

    return psObj;
}

/**********************************************************************
 *                         _AVCE00ReadBuildSqueleton()
 *
 * Build the squeleton of the E00 file corresponding to the specified
 * coverage and set the appropriate fields in the AVCE00ReadPtr struct.
 *
 * Note that the order of the sections in the squeleton is important
 * since some software may rely on this ordering when they read E00 files.
 *
 * The function returns the coverage precision that it will read from one
 * of the file headers.  
 **********************************************************************/
static int _AVCE00ReadBuildSqueleton(AVCE00ReadPtr psInfo, 
                                     char **papszCoverDir)
{
    int         iSect, iTable, numTables, iFile, nLen;
    char      **papszTables, **papszFiles, szCWD[75]="", *pcTmp;
    char       *pszEXPPath=NULL;
    int         nCoverPrecision = AVC_DEFAULT_PREC;
    char        cPrecisionCode = '2';
    const char *szFname = NULL;
    AVCBinFile *psFile=NULL;

    psInfo->numSections = 0;
    psInfo->pasSections = NULL;

    /*-----------------------------------------------------------------
     * Build the absolute coverage path to include in the EXP  0 line
     * This line usually contains the full path of the E00 file that
     * is being created, but since the lib does not write the output
     * file directly, there is no simple way to get that value.  Instead,
     * we will use the absolute coverage path to which we add a .E00
     * extension.
     * We need also make sure cover path is all in uppercase.
     *----------------------------------------------------------------*/
#ifdef WIN32
    if (psInfo->pszCoverPath[0] != '\\' &&
        !(isalpha(psInfo->pszCoverPath[0]) && psInfo->pszCoverPath[1] == ':'))
#else
    if (psInfo->pszCoverPath[0] != '/')
#endif
    {
        if (getcwd(szCWD, 74) == NULL)
            szCWD[0] = '\0';    /* Failed: buffer may be too small */

        nLen = strlen(szCWD);

#ifdef WIN32
        if (nLen > 0 && szCWD[nLen -1] != '\\')
            strcat(szCWD, "\\");
#else
        if (nLen > 0 && szCWD[nLen -1] != '/')
            strcat(szCWD, "/");
#endif
    }

    pszEXPPath = CPLStrdup(CPLSPrintf("EXP  0 %s%-.*s.E00", szCWD,
                                      strlen(psInfo->pszCoverPath)-1,
                                      psInfo->pszCoverPath));
    pcTmp = pszEXPPath;
    for( ; *pcTmp != '\0'; pcTmp++)
        *pcTmp = toupper(*pcTmp);

    /*-----------------------------------------------------------------
     * EXP Header
     *----------------------------------------------------------------*/
    iSect = _AVCIncreaseSectionsArray(&(psInfo->pasSections), 
                                  &(psInfo->numSections), 1);
    psInfo->pasSections[iSect].eType = AVCFileUnknown;
    psInfo->pasSections[iSect].pszName = pszEXPPath;

    /*-----------------------------------------------------------------
     * We have to try to open each file as we go for 2 reasons:
     * - To validate the file's signature in order to detect cases like a user
     *   that places files such as "mystuff.txt" in the cover directory...
     *   this has already happened and obviously lead to problems!)
     * - We also need to find the coverage's precision from the headers
     *----------------------------------------------------------------*/

    /*-----------------------------------------------------------------
     * ARC section (arc.adf)
     *----------------------------------------------------------------*/
    szFname = (psInfo->eCoverType==AVCCoverV7 || 
               psInfo->eCoverType==AVCCoverPC2 ) ? "arc.adf": "arc";
    if ( (iFile=CSLFindString(papszCoverDir, szFname)) != -1 &&
         (psFile = AVCBinReadOpen(psInfo->pszCoverPath, szFname,
                                  psInfo->eCoverType, AVCFileARC,
                                  psInfo->psDBCSInfo)) != NULL)
    {
        if (nCoverPrecision == AVC_DEFAULT_PREC)
            nCoverPrecision = psFile->nPrecision;